Key to colours
b- Blue br - Brown
w - White
o- Orange
gr - Grey
g/y - Green/Yellow
230V |
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50Hz |
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| Y Plan |
L N E | b |
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| g/y | w | Diverter |
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| Cylinder | Valve |
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| Stat | gr |
| Room | 1 | o |
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| Stat | C 2 |
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System Control |
| S/L | E | N | P/L |
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| Boiler Connection | |
Wiring Centre |
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| (4 Core Wire) | |
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Timer |
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L |
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N | N E | L |
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CH on |
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HW on |
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HW off | Pump |
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Y Plan, Room Thermostat System, CH Interlocked By Room Thermostat, DHW Interlocked By Cylinder Thermostat
At least the Radiator(s) near the Room Thermostat not TRV’d
Pump run from Switched Live
6.0System Details
6.6System Controls & Wiring
This boiler requires a permanent live for operation of the condensate pump and frost protection.
1.To comply with Part L1 of the Building Regulations the heating system into which the boiler is installed should include the following:
a)zone controls
b)timing controls
c)boiler control interlocks
2.Such a system needs to be fully pumped and must provide independent temperature and time control to both the heating and hot water circuits and have a boiler and system pump interlock.
3.The boiler should be controlled so that it operates on demand only. Where it is proposed to effect control by thermostatic radiator valves a room thermostat should also be provided to switch off the boiler when there is no demand for heating.
230V
50Hz
L N E
System Control
Wiring Centre
Timer
L
N 
CH on 
HW on
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| b | gr |
gr |
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b | Motor |
| Motor |
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| br | |
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br | S Plan | o | g/y S Plan |
g/y | Valve |
| Valve |
| Room | Cylinder | o |
| Stat | Stat |
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S/L E N P/L
Boiler Connection
(4 Core Wire)
N E L
Pump
S Plan, Room Thermostat System, CH Interlocked By Room Thermostat, DHW Interlocked By Cylinder Thermostat
At least the Radiator(s) near the Room Thermostat not TRV’d Pump run from Switched Live
© Baxi Heating UK Ltd 2011 | 13 |
